A body of mass 5kg is thrown vertically up with velocity $20 \frac{m}{s}$ . What will be its momentum just before hitting the ground? Take upward direction as positive.

100 Kg m/s

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0 Kg m/s

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-100 Kg m/s

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-20 Kg m/s

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Solution

The correct option is C -100 Kg m/s
The velocity of the ball just before hitting the ground will be equal to the initial velocity of the ball but in a downwards direction.

Since upward direction is positive, the velocity of the object in the downward direction is negative.

Velocity $V$ just before hitting the ground is $- 20 \frac{m}{s}$

mass of the ball $M = 5 K g$

Momentum $P = M V$
$P = 5 \times (- 20) = - 100 K g \frac{m}{s}$

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A body of mass 5kg is thrown vertically up with velocity 20ms. What will be its momentum just before hitting the ground? Take upward direction as positive.

A body of mass 5kg is thrown vertically up with velocity $20 \frac{m}{s}$ . What will be its momentum just before hitting the ground? Take upward direction as positive.